Now that she's confirmed her pregnancy, Jessica Simpson has nothing to hide -- not even her baby bump!

The knocked-up singer showed off her brand new curves Sunday night on Twitter, posting "Bumpin' and Proud" along with a photo of her in a skimpy bikini.

With her belly already starting to show, it looks like Jess is already starting to gain back some of the 50 pounds she reportedly dropped after having daughter Maxwell. She also appears to be wearing little-to-no makeup ... and still looks great!

Simpson is currently on vacation in Hawaii with fiance Eric Johnson, sister Ashlee Simpson, BFF Cacee Cobb and Donald Faison.

Check out the gallery above to see more of Jessica's most eye-popping looks!

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